Hi Everyone,
About three years ago I purchased a large Franklin 16" Grip-Rite 500 Playground Ball from K-Mart. It lasted a long while, but eventually went flat because of a slight leak.
While at Discount (Advanced) Auto parts store I purchased a bottle of Fix a Flat and was able to repair the leak buy injecting it into the ball using an glue syringe I purchased at West Marine boating supply store. The glue syringe is all plastic, and the tip of it is narrow enough to fit into the ball's air valve.
The ball was about 3/4 full of air when I added the Fix a Flat. I added the Fix a Flat and shook the ball after each injection. I stopped adding the Fix a Flat when I could hear it splashing around inside, all together about 10 one ounce injections of Fix a Flat. I then added enough air to inflate the ball and the Fix a Flat appears to be working.
Hope this tip helps others, Keller Beyer